THE GRANARY WEEVIL 
13 
Prothorax dorsally not divided, but two areas, praescutal and scuto-scutellar, 
are roughly indicated by rows of setae. Prsescutal area with six pairs of setae, 
the last two of which occur on the alar lobe, scutoscutellar area with four pairs 
of setae. The thoracic spiracle is located on a lobe pushed into the prothorax from 
the epipleurum of the mesothorax. It is bifore, elongate, larger than abdominal 
spiracles, and placed with the fingerlike air tubes pointing dorsad. 
The mesothoracic and metathoracic segments are divided above into two 
distinct areas, a spindle-shaped praescutum provided with two pairs of minute 
setae, and the scuto-scutellum and alar area. The scuto-scutellum has eight 
pairs of setae and two pairs of hairs on each alar lobe. The epiplerum of the 
mesothorax and metathorax bears a pair of setae. The sternum of the thorax 
consists of a median area or eusternum and two lateral lobes more or less con- 
nected medianly behind the sternum. The median portion is the sternellum 
and the lateral portions are the parasternal plates. Each thoracic sternum 
bears a pair of hairs, each coxal lobe of prothorax bears three pairs of hairs, and 
each coxal lobe of mesothorax and metathorax bears five hairs. 
Each tergum of first four abdominal segments divided above into three distinct 
areas, praescutum, scutum, and scutellum. Each tergum of fifth to seventh 
abdominal segments divided above into only two areas, the first containing 
praescutal and scutal elements, the second representing the scutellum. Below 
these two areas and adjacent to the epipleurum is the alar area. Below a very 
indistinct and abrupt dorsolateral suture and above a well-defined ventro- 
lateral suture is a large, not subdivided epipleurum. The abdominal epipleura 
are located considerably higher than the thoracic lobes. Below the ventrolateral 
suture is the hypopleurum, subdivided into three lobes, one directly below 
another. Below the hypopleurum is the coxal lobe and below that the sternum 
consisting of the eusternum and a posterior triangular area representing the 
parasternum or the parasternum fused with the sternellum. Abdominal segments 
provided with setae, as follows: Each praescutum bears a pair of setae; each 
scutellum bears three lateral setae; each alar area bears a pair of setae, and each 
epipleural lobe bears a pair of setae. The second part of each hypopleural lobe 
bears a seta, each coxal lobe bears a seta, and there is a pair on the eusternum. 
Eighth abdominal segment smaller than the typical segment; tergum declivous 
and without distinct tergal areas; ninth segment rather small; tenth ventral and 
very small. Abdominal spiracles placed anteriorly and in a small separate 
corner piece, probably of the alar area; spiracles bifore and found on abdominal 
segments 1 to 8, that on the eighth being located slightly more dorsad than the 
rest. 
Measurements of larval stages 
Stage 
Width of 
larval head 
1 
Mm. 
0. 25 to 0. 26 
. 36 to .37 
. 47 to . 48 
2. 
3 .... 
4__ 
. 61 to . 65 
THE PUPA 
Pupa (fig. 8) uniformly white when first formed; length 3.75 to 4.25 mm., 
width 1.75 mm. Tips of elytra attaining fifth abdominal segment, inner wings 
rudimentary and almost completely concealed by elytra. Tips of metathoracic 
tarsi extending beyond tips of elytra. Head rounded, beak elongate. Head 
with two prominent spines toward vertex, a group of two small spines and two 
spinules on each side above eyes, two pairs of small spines near anterior margin 
and one on each side of front between eyes, three pairs of spines on beak between 
frontal ones and base of antennae, a pair of small ones on beak midway between 
base of antennae and tip of beak, a pair on sides of beak between latter pair and 
tip of beak, and two pairs of minute spines on tip of beak. Prothorax provided 
with one pair of anteromarginal setigerous tubercles, one pair of anterolateral, 
two pairs of mediolateral, and four pairs of dorsal setigerous tubercles; also a 
pair of minute mediolateral ventral spines. Mesonotum and metanotum nor- 
mally each provided with three pairs of spines; one or more pairs often missing. 
Abdomen with seven distinct dorsal tergites, the seventh being much larger than 
